Toroidal coil winding machine

Abstract

A toroidal coil winding machine for winding a wire in a coil on a work such as a toroidal core of a magnetic head comprises, as the principal components, a rotary table for fixedly holding a work thereon, capable of being turned intermittently through an angle of 180° at a time, a pair of mobable arms disposed on the diametrically opposite sides of the rotary table, respectively, provided with mechanical hands for gripping a wire, respectively, and capable of being moved between the respective front positions and the back positions, a clamping device for holding one free end of the wire, mounted on the rotary table, a loop holding device for holding loops of the wire wound on the work while the rotary table is stopped, mounted on the rotary table, a wire reel for feeding the wire, a wire holder disposed near the wire reel for temporarily holding the wire drawn out from the wire reel, and a cutter disposed near the wire holder for cutting the wire in a predetermined length. The movable arms are advanced to the front positions, respectively to transfer the other free end of the wire from one to the other or from the other to the one of the mechanical hands. After the other free end of the wire has been passed through an opening formed in the work and has been gripped by one or the other of the mechanical hands, the rotary table is turned through an angle of 180° to wind the wire on the work.

What is claimed is: 
     
       1. A coil winding machine comprising: a rotatable table for supporting a workpiece having an opening;   wire clamping means for supporting one end of a wire to be inserted through said opening and being mounted on the table;   a first and a second arm arranged at two sides of the table movable relative to said table;   at least two hands for holding and releasing the wire which can be rotated around an axis parallel with an axis of said table and each respectively supported by one of said arms;   centering means mounted on the table for positioning a free end of the wire toward a central part of the opening when the wire is to be inserted into the opening by the hands;   guide means for guiding the free end to the central part of the opening;   wire delivery means arranged on the table at a side opposite to the guide means with said workpiece held therebetween, being movable relative to the opening for holding the free end of the wire inserted into the opening at one of said hands and delivering the free end towards the other of said hands while positioning the free end at a specified location; and   moving means for raising or lowering said table by an amount corresponding to a diameter of the wire and winding the wire around the opening;   wherein said hands each comprise a fixed position pawl member which can be opened or closed around a guide shaft and a movable pawl member, said movable pawl member being movable relative to the fixed position pawl member by said guide shaft, a holding force on said wire of said movable pawl member being weaker than a holding force on said wire of said fixed position pawl member, and with a center line of said movable pawl member and the fixed position pawl member passing through a rotational center of the table.   
     
     
       2. A coil winding machine comprising: a rotatable table for supporting a workpiece having an opening;   wire clamping means for supporting one end of a wire to be inserted through said opening and being mounted on the table;   a first and a second arm arranged at two sides of the table movable relative to said table;   at least two hands for holding and releasing the wire which can be rotated around an axis parallel with an axis of said table and each being supported by one of said arms;   centering means mounted on the table for positioning a free end of the wire towards a central part of the opening when the wire is to be inserted into the opening by the hands;   guide means for guiding the free end towards the central part of the opening;   delivery means arranged on the table at a side opposite to the guide means with said workpiece held therebetween, being movable relative to the opening, for holding the free end inserted into the opening at one of said hands and delivering the free end towards the other of the hands while positioning the free end to a specified location; and   moving means for raising or lowering said table by an amount corresponding to a diameter of the wire and winding the wire around the opening;   wherein said centering means includes at least a first and a second shutter member perpendicular to a direction of movement of the free end, and wherein said first and second shutter members grasp therebetween the free end so as to position the free end.   
     
     
       3. A coil winding machine comprising: a rotatable table for supporting a workpiece having an opening;   wire clamping means for supporting one end of a wire to be inserted through said opening and being mounted on the table;   a first and a second arm arranged at two sides of the table movable relative to said table;   at least two hands for holding and releasing the wire which can be rotated around an axis parallel with an axis of rotation of said table and each respectively supported by one of said movable arms;   centering means mounted on the table for positioning a free end of the wire toward a central part of the opening when the wire is to be inserted into the opening by the hands;   guide means for guiding the free end to the central part of the opening;   wire delivery means arranged on the table at a side opposite to the guide means with said workpiece held therebetween, being movable relative to the opening, for holding the free end inserted into the opening at one of said hands and delivering the free end towards the other of said hands while positioning the free end at a specified location; and   moving means for raising and lowering said table by an amount corresponding to a diameter of the wire and winding the wire around the opening;   wherein said delivery means includes a suction path so as to pull the free end through said suction path.   
     
     
       4. A coil winding machine comprising: a rotatable table for supporting a workpiece having an opening;   wire clamping means for supporting one end of a wire to be inserted through said opening and being mounted on the table;   a first and a second arm arranged at two sides of the table movable relative to said table;   at least two hands for holding and releasing the wire which can be rotated around an axis parallel with an axis of said table and each respectively supported by one of said movable arms;   centering means mounted on the table for positioning a free end of the wire toward a central part of the opening when the wire is to be inserted into the opening by the hands;   guide means for guiding the extremity free end to the central part of the opening;   wire delivery means arranged on the table at a side opposite to the guide means with said workpiece being held therebetween, for holding the free end inserted into the core opening at one of said hands and delivering the free end towards the other of said hands while positioning the free end at a specified location; and   moving means for raising or lowering said table by an amount corresponding to a diameter of the wire and winding the wire around the opening;   wherein said moving means raises and lowers said table synchronously with a rotation of the table and provides an amount of raising or lowering of the table corresponding to a diameter of the wire.